I too have a ferret that hisses, but it's my new baby (relatively new, you all may remember the post back in mid-November about the big ferret baby that ran into a vacant townhouse that was being cleaned by maintenance and they requested that we go get him so that they could finish). Prior to that, I think a couple of mine hissed when they were younger and playing or rough housing around. Buddy has done this since we brought him home, and we get a kick out of it. He does it when he's chasing around the other weasels (Oliver will hiss back at him), trying to entice someone to play, and I used to hiss back at him when he was playing and sometimes he'd hiss back at me. It was a battle of the wills, now when he hisses and try to keep it going by hissing back at him, he just stops so it's not as much fun anymore, but I still love it when he does it. Jen [Posted in FML issue 5147]